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import types
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FLATTEN_TYPES = (tuple, list, types.GeneratorType)
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def flatten (*items):
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"""
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Flatten common containers/iterables
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>>> list(flatten())
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[]
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>>> list(flatten(1, 2, 3))
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[1, 2, 3]
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>>> list(flatten((1, 2, 3)))
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[1, 2, 3]
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>>> list(flatten((1, 2), 3))
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[1, 2, 3]
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>>> list(flatten((1, ), [2], (i for i in [3])))
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[1, 2, 3]
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"""
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for item in items:
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if item is None:
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continue
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elif isinstance(item, FLATTEN_TYPES):
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for node in item:
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yield from flatten(node)
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else:
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yield item
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def merge (*dicts, **kwargs):
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"""
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Merge dicts.
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>>> merge(foo=1, bar=2)
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{'foo': 1, 'bar': 2}
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>>> merge(dict(foo=1), bar=2)
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{'foo': 1, 'bar': 2}
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>>> merge(dict(foo=1), bar=2, foo=3)
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{'foo': 3, 'bar': 2}
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>>> merge(dict(foo=1), dict(bar=2), foo=3)
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{'foo': 3, 'bar': 2}
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>>> merge(dict(bar=2), dict(foo=1), foo=3)
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{'foo': 3, 'bar': 2}
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>>> merge(dict(foo=1), dict(foo=2), foo=3)
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{'foo': 3}
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"""
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# later duplicate keys override
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return {k: v for d in (dicts + (kwargs, )) for k, v in d.items()}
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